Appropriate procedures to increase the adherence of children to blood collection: A cross‐sectional study oleh Hideki Yui, Sanae Otawa, Sayaka Horiuchi, Megumi Kushima, Ryoji Shinohara, Reiji Kojima, Yuka Akiyama, Tadao Ooka, Kunio Miyake, Hiroshi Yokomichi, Zentaro Yamagata, The Yamanashi Adjunct Study of the Japan Environment and Children's Study Group